Welcome to the E46Fanatics forums. E46Fanatics is the premiere website for BMW 3 series owners around the world with interactive forums, a geographical enthusiast directory, photo galleries, and technical information for BMW enthusiasts.

You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please contact contact us.

I posted this up a few weeks ago in the Xi forum and figured it would also apply to non-Xi's as well. Here you go:

Quote:

Originally Posted by Messe46

Hey Guys,
So it's time for my rear shocks to be replaced and I was searching around for info between the 2 shocks list above (Sport and HD, for those who can't/don't read everything ). All the stuff I came across in the "xi section" did not help answer my question: "what's the real difference(s) between the 2?"
That's when I finally called up Bilstein directly, down in Mooresville, NC. The woman I spoke to sounded very knowledgeable, confident, and timely in her responses (did not have to put me hold on, etc. after I asked my questions).

Here's what I came up with:
The Sports and HDs have the exact same internals (same valving, compression ratios, rebound, etc.). The difference in the 2 is the height of the outer tube, which is to accommodate different spring heights. She assured me that the 2 shocks will have similar ride qualities, but the sport will be slightly stiffer. This is not because of internals, but rather the shorter tube length makes for the ride to be slightly stiffer since there is less room form the fluid to move (there's probably more head-loss and other factors from having more area to move (I'll let you know when I take compressible flow next semester )).
As for ride height (important for me and others in areas with snow (Vermont for me)), the car will have the same height whether you have the Sports or HDs (ride height will depend on the springs you use).**Read this if you read nothing else** She also told me that if you have any lowering springs (H&R, Eibach, etc) with the HD shocks and the shocks blow-out, YOUR WARRANTY IS VOID!!! I don't know about you, but that helped me make up my mind on which ones to get.

I hope that helps anyone else out if they were in the same boat as me.

Disclaimer: this is based on information provided by Bilstein in Mooresville, NC. This is not my opinion or fact, nor am I stating it is. Other factors, such as tires, rim size/weight, and other modifications done to your car might have varied results.

__________________

-Mike
“I’m sorry, but having an Aston Martin DB9 on the drive and not driving it is a bit like having Keira Knightley in your bed and sleeping on the couch. If you’ve got even half a scrotum it’s not going to happen.”
-Jeremy Clarkson

hummer... I've seen you post that a couple of places... any specifics on that? I have that setup for the time being, and i'm trying to decide whether to go back to boge all around or bilstein all around. There's definitely a disconnect btwn front and rear, but nothing that I've noticed that is just awful.

If you have done this mixing of shocks and you don't have a problem, that's fine for you. But, I would never advise some one to do it. I installed just plain old new struts once with older worn rear shocks and the car felt really wierd and loose in back. Bilstein sports or HDs are even more different than worn OEM. So, this practice could actually be dangerous in some situations.